Where are the other AO settings in blender internal?
Most of those have similar properties in the gather panel in your screenshot for the Blender Internal ambient occlusion:


Samples - in gather panel
Distance (attenuation distance in BI) - in gather panel
Strength - Factor in AO panel
Attenuation - Falloff Strength ("Falloff" must be enabled)


Note: You will probably want to change the AO to multiply instead of add to further mimic these settings. It is also important to mention that these are two different AO systems and don't have the same functionality.